The Value of Recycling PCB Plating Waste Liquid
Investing in the comprehensive application of PCB plating waste liquid can lead to financial savings and reduced costs in the long term. PCB plating involves various chemical products, and the waste liquid produced in this process can be repurposed as a valuable resource through proper treatment. Once discharged, it transforms into a harmless substance, making its utilization beneficial.
Benefits of Gold Recovery
Gold, known for its chemical volatility and exceptional properties such as corrosion resistance and low-temperature oxidation resistance, is a valuable component in PCBs. To maximize its benefits, it is crucial to use the smallest amount efficiently due to its limited availability.
Recycling Process for Gold Recovery
- Heat the PCB gold waste liquid to 80-90 degrees Celsius.
- Gradually add ferrous chloride solution while stirring intermittently.
- The reaction: Au³⁺ + 3Fe²⁺ → 3Fe³⁺ + Au↓
- Observe the color change from yellow to white as gold powder settles at the bottom.
- Continue adding excess ferrous chloride solution and let it stand for several hours.
- To confirm gold recovery, mix two drops of the liquid with 1% potassium ferricyanide; a blue color indicates successful recovery.
Utilizing PCB plating waste liquid not only reduces environmental impact but also offers cost-saving opportunities. Gold recovery from waste liquid showcases the importance of efficient resource management in PCB production processes.
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